feat: Add paddlepaddle dep and pin all versions

requirements.txt

@@ -1,4 +1,5 @@
-qdrant-client
-llama-index
-fastembed
-paddleocr
+qdrant-client==1.8.2
+llama-index==0.10.23  # replace with instructor
+paddleocr==2.7.3
+paddlepaddle==2.6.1
+fastembed==0.2.6